fix: get rid of poll.vote function

Author: eug-vs

models/polls/poll.model.ts

@@ -1,10 +1,5 @@
 import { Model, model } from 'mongoose';
 import { PollSchema, pollSchema } from './poll.schema';
 
-pollSchema.methods.vote = function(userId: string, which: 'left' | 'right'): PollSchema {
-  this.contents[which].votes.push(userId);
-  return this.save();
-}
-
 export default model<PollSchema, Model<PollSchema>>('Poll', pollSchema);